digital timer install to a three way switch

I have read all the posts regarding this and I am still unable to get it working. i have a timer, red, white, black and green wires. The wires inside the switch box are: 2-black, red, bundle of whites.
Can anyone help?

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digital timer install to a three way switch

1. Does the box have space for the timer or are you removing the 3 way switch to install the timer?

2. When the other 3 way switch would have the light on, what should the timer do?

3. When the other 3 way switch would have the light off, what should the timer do?

4. What are the descriptions of the red and black wires on the timer?

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